Mechanical movement



(Nd Model.)

L. E. WALLERMAN.

MECHANICAL MOVEMENT. No. 300,419. r Patented June 17, 1884.

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UN rrnn Stern s LOUIS H. W ALLERBYJ OF MIL\VATKEE, XVISCONSIN.

MECHANlCAL movement SPECIFICATION forming part of Letters Patent No.GOO/H9, dated June 17, 188%.

Application filed January 152, 1584. (No model.)

To a-F who/2t it may concern/.-

Be it known that 1, Louis E. XVALLERMAN, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofXVisconsin, have invented certain new and useful Improvements inMechanical Movements; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part ofthisspecification.

My invention relates to improvements in mechanical movements, and theobject thereof is to provide means by which an adjustable circular camof a given diameter may be rotated with greater or less eccentricity toits supporting-shaft or in line with such shaft between and in contactwith the bearings of two rigid immovable arms of a lever, whereby, bythe adjustment of said cam toward or from the center of such shaft, thethrow of the lever may be increased, diminished, or stopped, and wherebysaid lever is moved in both directions solely by said cam without theaid of springs, and a more positive movement is attained at a lessexpense of power than by the ordinary methods. This movement is adaptedto be used in converting rotary into reciprocating motion whenever it isdesirable for any purpose to increase or diminish the length of themovement of an arm which is actu ated by an eccentric, and it isespecially adapted to be used in connection with a sewing-machine, iortransmitting motion to the feed mechanism, as by its application to suchpurpose the feed mechanism is readily adjusted for short or longstitches, as may be required. I have therefore illustrated one manner ofapplying my invention in connection with a sewing-machine, and thedrawings and specification illustrate and describe the invention thusapplied.

Figure 1 represents the arm and bed-plate of a sewing-machine, part insection, showing a side view of my adjustable cam upon the band-shaft inconnection with the vibrating lever. Fig. 2 is a longitudinal section ofthe band-shaft and cam in connection with the cam-adjusting" device.Fig. is a side view of the cam upon a band-shaft, showing theband-wheel, the adjusting-knob, and part of the band-shaft in section.cross-section of the band-shaft, the adjustable cam, and the device bywhich the same is adjusted.

Like parts are represented by the same ref erence-lettcrs throughout theseveral views.

A represents the ordinary band-shaft, B the band-wheel, and O the arm,of a sewingmachine.

D is my improved adjustable cam, from and by which mot-ion iscommunicated to the feed-lever B through the cam-lever F. The cam-leveris centrally pivoted on the pivotal bolts G, in the ordinary manner.Hcreto fore it has been common to provide the camlever with but one armonly, when, as before mentioned, the said lever F is moved in onedirection by the action of the cam and in the opposite direction by theaction of a spiral spring, which spring is usually attached to the longarm of the i'ceddever E. By my improvement the cam-lever F is providedwith two arms, H H, which operate upon the respective sides of the camD, whereby said lever is caused to vibrate toward the right and leftwith each rotation of said cam.

I-Ieretofore it has been common to use a conical cam adapted to be adjnsted longitudinally upon the band-shaft A relatively to the cambearing-surlhce of the cam-lever F,whereby the length of stitch isincreased or diminished as the greater or less diameter of said conicalcam is brought in contact.- with the bearing-surface of said cam-lever.It is obvious that it would be impossible to use a conical cam with afork or twoarmed lever, as such arms would not simultaneously bear uponboth sides of such cam, except at one point of adjustment only, for ifadjusted to the greater diameter they would not fit the less, or, on thecontrary, if adjusted to the less diameter would not fit the greater. Bymy improvement I am enabled to dispense with the conical-shaped cam anduse one having horizontal bearings, as shown in Figs. 2 and 3, and thelength of stitch is governed by adjusting said cam eccentrically to saidbandshaft, which end is accomplished through the knob .T, rod Iii,eccentric L, and pins M Fig. i is a vertical IOC WVhen the cam D, rod K,eccentric L, and pins M N are adjusted relatively to each other, asshown in Fig. 4, said parts all move together, describing a true circlearound a common center, without communicating any motion whatever to thecam-lever F, and the required vibrating motion is attained only as saidcam D is adjusted eccentrically to said band-shaft toward the left,which end is accomplished by turning the rod K, when it is ob vious bysuch movement that the eccentric pin L will approach the vertical eitherabove or below the common center of such parts, and thereby carry thecam D toward the left, said cam D being adapted to be adjusted and thelength of the stitch increased or diminished a distance corresponding tothe space 0 between the periphery of the band-shaft and the innersurface of said cam. The pins M N are rigidly fixed at their outer endsin the cam D, while their inner ends bear against the surface only ofthe eccentric L, and permit of the required movement of said eccentric Las said cam D is adjusted. It is obvious that the periphery of the cam Dis formed in a true circle, as well as that of the band-shaft A andadjusting-rod K, and that the same is adapted to serve as a cam only asit is adjusted eccentric to said band-shaft by turning said rod K.

In operation the band-shaft A, rod K, with eccentric L, and cam D, allrotate together. Vhen desired to increase or diminish the length of thestitch, such end is accomplished by holding the band wheel or shaft atrest and turning the knob J. The knob J, being rigidly affixed to therod K, carries with it the eccentric pin L, which, acting against theinner ends of the pins M and N, move said cam D in or out of centerrelatively to said band shaft, whereby the vibrating movement of thecam-lever F is increased or diminished corresponding to the adjustmentof said cam, and

the feed'lever E, which is actuated thereby,

er or less distance, and thus, as stated, increase I or diminish thelength of stitch.

It is obvious that, the upper end of the camlever being divided, as itis, into two arms, the same is adapted to be moved both toward the rightand left with a positive movement, and the spring by which one of saidmovements has heretofore been attained is dispensed with.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The mechanical movement herein described, consisting in thecombination of a circular adjustable cam, D, having a uniform diameter,with the shaft A and arms H H of lever F, said cam being adapted by itsadjustable attachment with said shaft to be adjusted more or lesseccentric thereto within said arms, whereby the vibration of said leverF is increased or diminished, substantially as and for the purposespecified.

2. The combination, with the shaft A, of the adjustable cam D,providedwith bearings M N, rod K, provided with eccentric pin L, and lever F,provided with arms H H, said cam D being adapted, by turning said rod K,to be adjusted accentric to said shaft A, substantially as and for thepurpose specified.

3. The combination of shaft A, adjustable cam D, of uniform diameter,and lever F, having rigid arms H H, said cam being adapted to vibratesaid lever F in both directions unaided by spring, and to be adjustedeccentric to said shaft between said arms, all substan tially as and forthe purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

LOUIS E. WALLERMAN.

Witnesses:

O. T. BENEDICT, G. E. STELLER.

